Mammoth Grey Stripe Sunflower

Classic, iconic, giant-headed sunflower. Grow them for eating the seeds or to create an impressive hedge or maze. Heads are typically 10-12" wide, and plants are typically 6-12' tall.

Sunflowers are native to the Americas and their seeds have been found at the San Andres dig site in Tabasco, Mexico (dating to 2600 BC) and in dig sites in Tennessee (as early as 2300 BC). Sunflowers bred for oil seed in Europe, Russia, and the United States are grown in monocultures, threatening the older native and heirloom sunflower varieties.

Days to maturity: 90-100

Seeds per pack: 40

Germination rate: 83% on 01/28/2022

Planting / harvesting notes

Sow seeds directly in full sun, keep soil from drying out, and thin seedlings to 12-18" apart. This species is an annual in most of North America, but may self-sow in subsequent years.

Seed keeping notes

To harvest the seeds, cut the dried, browned flowers flower heads into a paper bag. Dislodge the seeds by breaking apart the seedheads/flowers. Use a strainer to sift out the larger chaff. Use your breath, wind, or fans to winnow off lighter weight chaff. Birds will likely start eating the seeds as they develop, so consider how much you'd like to leave for them, and how much you would like to save for yourself. Best harvested for seed during a dry spell.